Carpenter&#39;s level and quadrant.



' No. 743,100. PATENTED NOV. 3, 1903'.

' W. POTTER. 1

GARPENTER'S LEVEL AND QUADRANT.

APPLICATION FILED JUNE 1. 1903.

N0 MODEL.

WITNESSES UNITE STATES Patented November 3, 1903.

PATENT OFFICE;

WILLIAM POTTER, OF NEW YORK, N. Y., ASSIGNOR TO POTTER LEVEL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

CARPENTERS LEVEL AND QUADRANT.

:EPEOIFICATION forming part of Letters Patent No. 743,100, dated November .3, 1903.

7 Application filed June 1, 1903; Serial No. 159.470. (No model.)

To all whom it 71mg concern:

Be it known'that I, WILLIAM POTTER, a citizen of the United States of America, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Carpenters Levels and Quadrants, of which the following is a specification, such as will enable those skilled in. the art to which it ap. pertains to make and use the same.

The object of this invention is to providean improved tool for the use of carpenters and others, which is adapted to serve as a plumb, level, and quadrant, a further object being to provide an instrument of this class which may be readily attached to and detached from an ordinary straight-edge and which is simple in operation and construction and well adapted for the purpose for which it is intended.

The invention is fully disclosed in the following specification, of which the accompanying drawings form a part, in which the separate parts of my improvement aredesignated by suitable reference characters in each of the Views, and in which- Figure 1 is a plan view of my improvement in operative connection with a straight-edge; Fig. 2, a view similar to Fig. 1, but showing the parts in a different position; Fig. 3, a bottom plan View of my instrument removed from the straight-edge; Fig. 4, a section taken on the line-4 4 of Fig. l, and Fig. 5 a section taken on the line 5 5 of Fig. 1.

In the drawings forming part of this specification I have shown at a the base-plate of my instrument, upon which is pivotally mounted at a a spirit-level 1), consisting of the usual tube 12 and a base-flange 17 through which passes the pivot-screw b, which is held therein by a lock-nut 79 The pivot-screw 5 also passes through a tongued member b of the base-plate a, which is formed therein by a segmental slot b and which operates as a spring for the spirit-level b, serving to maintain a frictional contact between said spiritlevel and the base-plate a. The base-plate a a through ninety degrees of a circle is adapted to operate with the free end of the tube b".

Pivotally mounted near the top of the baseplate a is a plate 0, provided with two arms 0 and 0 the longer of which, 0 is curved upwardly and hackwardly, as shown at 0 while the other, 0 of which is straight and bears against the upper side of the tube 11 and serves to hold the same in place.

Mounted on the base-plate a at the bottom thereof is a block d, through which passes a pin or screw d arranged in a slot 61 which is at an angle to the sides of the block d, and near the top of the base-plate a and at the left thereof is a similarly-constructed block d provided with a slot d and a pin or screw (1, and the spirit-level b when in its normal position rests on the block at, and when arranged at right angles thereto the spirit-level rected portion 6 of the base-plate a, and, as

The hook-shaped members e are adapted to engage screws or pins f and f secured in a straight edge f upon which the base-plate a rests and at predetermined places thereon, the curved plates 2 having previously been placed in the position shown at the left of Fig. 2 by moving the arm a and when this arm is again drawn into its normal position the curved plate a bears against the screw f or f and holds thebase firmly in position, and if the position of the base-plate a is not true adjustment thereof may be accomplished by means of the screws e and e as hereinbefore stated. The base-plate a is also provided with a V-shaped recess at each side thereof, as shown at g and g which serve as permanent positions for supplemental screws when the exact adjustment of the instrument is determined, or one of the recesses g or 9 may be employed in conjunction with the one of the adjusting devices e or e on the opposite side of the base-plate a.

In practice I prefer to place my instrument in a suitable recess on the straight-edge f as shown at h, Fig. 4, in order to protect the same from accident; but it may also be placed on the surface thereof, as will be readily unders'tood.

In Fig. 1 of the drawings I have shown my instrument in position for use as a level and held in this position by means of the arm 0 while in dotted lines in the same view is shown the position for use as a plumb, and the spiritlevel I) is held in this position by the arm 0 of the plate 0.

When the instrument is not in use, I preferably place the parts in the position shown in Fig. 2, whereby the glass tube of the spiritlevel is well protected, and the curved portion of the arm 0 may be so formed as to be sprung on the tube 12 thus preventing the removal therefrom by accident.

It will be apparent that various changes in the construction shown and described may be made within the scope of my invention, and with this reservation What I claim as new, and desire to secure by Letters Patent, is

l. Aninstrumentof the class described comprising a base-plate, a tongue formed therein, a spirit-level pivotally mounted on said ton gue,a quadrant-scale on said base-plate adjacent to said spirit-level and in cooperation therewith, a plate pivoted on said base-plate and adapted to lock said spirit-level in predetermined positions, a segmental rib on said base-plate upon which said spirit-level moves, and means for securing said base-plate to a straight-edge substantially as shown and described.

2. An instrument for the use of carpenters and others in connection with a straight-edge, comprising a base-plate, a spirit-level pivoted thereon, a plate adjacent to said spirit-level adapted to serve as a lock therefor, means for securing said base-plate to said straight-edge consisting of a plate pivoted to each end of said base-plate and provided each with a hemispherical member on its inner end, a raised portion of said base-plate within each of said hemispherical members, a screw passing into each side of said hemispherical member and bearing on the corresponding raised portion of said base-plate, a hook-shaped member on the outer ends of said last-named plates, an arm pivoted to said hooked member, a curved plate pivoted to said arm and operating in connection with said hooked member, and screws secured in said straight-edge, adapted to be engaged by said hooked members, substantially as shown and described.

' In testimony that I claim the foregoing as my invention I have signed my name, in presence of the subscribing witnesses, this 28th day of May, 1903.

WILLIAM POTTER.

Witnesses:

AUGUST J. BEssoN, PAUL EDWARD WISCH. 

